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Fixed Sludge Blanket Level In Clarifiers And Settlement Tanks

SludgeWatch 8200w²

Sludge blanket level. Quick and reliable sludge/water interface position detection. Triggers de-sludging at the perfect interval, eliminating unnecessary pumping costs.

Sludge Blanket Level

DTG6 A LED Display, 24 VDC Source 3-wire Switch Output

  • Description
  • Specification
  • Options
  • Application
  • Downloads

The SludgeWatch 8200w² Monitor provides a reliable method of detecting the sludge blanket level in clarifiers and settlement tanks, or increasing levels of suspended solids or sludge density in large range of processes.

Key Benefits

  • Eliminates guesswork and automatically provides a quick and easy check on the sludge/water interface position.
  • Facilitates the de-sludging process rather than relying on a timer, eliminating unnecessary pumping costs and producing a better-quality sludge for de-watering.
  • Mounts outdoors on the settlement tank bridge. IP65-rated enclosure doesn’t require additional protection.
  • Easy transmission to a control system, with simple radio integration if needed.


Control of the sludge blanket level is essential to ensure discharge consent compliance and efficient control of the treatment process. If the sludge blanket in a settlement tank is allowed to rise close to the surface there is a danger that solids will leave the tank and contaminate the next process stage or be discharged into the water course. Alternatively, if the sludge blanket is not allowed to stabilize or form a blanket or is pumped out too frequently the settlement process does not take place at all and solids will remain in suspension. Additionally there is a danger that thin sludge or water will be pumped from the bottom of the tank into the sludge handling system thus reducing the effectiveness of that process.

The SludgeWatch 8200w² Monitor is suitable for mounting outdoors on the bridge of settlement tanks, as the enclosure is IP65 rated and no outer enclosure is required. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available, allowing transmission directly to the control system without the need for installation of cables.

Fixed Sludge Blanket Level Detection Specifications

DIMENSIONS 185 mm (7.2”) x 213 mm (8.3”) x 95 mm (3.7”) (H x W x D) POWER RATING 0.8A
WEIGHT 1.4 kg (3.08 lbs) TERMINAL CORE SIZE Max Conductor Cross Section 2.5mm²
ENCLOSURE MATERIAL Polycarbonate RELAYS 3 x SPCO
ENCLOSURE RATING IP65 RATING 5A at 250VAC and 5A at 30VDC
CABLE ENTRIES 1 x M20, 4 x M16, 1 x USB Type A KEYPAD 6 Key
TEMPERATURE RATING -20 to +70°C, 0 to 95% Humidity (non-condensing) DISPLAY Sunlight Readable Black on White Graphic LCD
POWER SUPPLY 100 to 240 VAC 9 to 36 VDC BACKLIGHT On/Off/On after keypress wtih user adjustable contrast
STANDARD SENSORS DIMENSIONS WEIGHT OPTICAL PATH RANGE CABLE LENGTH SERVICE REQUIREMENT
IR8 Sensor 95 (3.7”) x 8 (0.3”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 8mm 0 – 30,000 10 metres (32.8 ft)
standard
No routine servicing
IR15 Sensor 95 (3.7”) x 15 (0.6”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 15mm 0 – 10,000 10 metres (32.8 ft)
standard
No routine servicing
IR40 Sensor 95 (3.7”) x 40 (1.6”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 40mm 0 – 1,500 10 metres (32.8 ft)
standard
No routine servicing
IR100 Sensor 95 (3.7”) x 100 (3.9”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 100mm 0 – 200 10 metres (32.8 ft)
standard
No routine servicing
SENSOR SETPOINT
TYPICAL APPLICATIONS
IR100 – Range 0 to 200mg/l
The sensor should only be used if the sludge is very ‘light’ with very clear supernatant.
5 to 95% of range Water Treatment
IR40 – Range 0 to 1,500mg/l
This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage
treatment applications and clarifiers in water treatment works.
5 to 95% of range Water Treatment Clarifiers
Sewage Treatment Final Settlement
Humus Tanks
IR15 – Range 0 to10,000mg/l
This sensor is also regularly used for sludge blanket detection and is normally used for primary
settlement in sewage treatment and sludge thickeners in water treatment.
5 to 95% of range Water Treatment Sludge Thickeners
Sewage Treatment Primary Tanks
IR8 – Range 0 to 30,000mg/l
This sensor should be applied on sludge thickeners in sewage treatment plants.
5 to 95% of range Sewage Treatment Thickeners
Note: Sensor ranges and detection points are appoximate and depend on the site-specific nature of the treatment process.

Sludge Detection Sensor TypesSludge Blanket Level Infrared Sensor Options

  • IR100: 0-200mg/l – This sensor is used when sludge is very “light” with very clear supernatant.
  • IR40: 0-1,500mg/l – This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage treatment applications and clarifiers in water treatment works.
  • IR15: 0-10,000 mg/l – This sensor is also regularly used for sludge blanket detection and typically used for primary settlement in sewage treatment and sludge thickeners in water treatment.
  • IR8: 0-30,000 mg/l – This sensor should be applied on sludge thickeners in sewage treatment plants.

Applications:

  • Final Settlement Tanks
  • Primary Settlement Tanks
  • Water Treatment – Clarifiers
  • Thickeners
  • Lamella Separators

The SludgeWatch 8200w² Monitor provides a reliable method of detecting the sludge blanket level in clarifiers and settlement tanks, or increasing levels of suspended solids or sludge density in large range of processes.

Key Benefits

  • Eliminates guesswork and automatically provides a quick and easy check on the sludge/water interface position.
  • Facilitates the de-sludging process rather than relying on a timer, eliminating unnecessary pumping costs and producing a better-quality sludge for de-watering.
  • Mounts outdoors on the settlement tank bridge. IP65-rated enclosure doesn’t require additional protection.
  • Easy transmission to a control system, with simple radio integration if needed.


Control of the sludge blanket level is essential to ensure discharge consent compliance and efficient control of the treatment process. If the sludge blanket in a settlement tank is allowed to rise close to the surface there is a danger that solids will leave the tank and contaminate the next process stage or be discharged into the water course. Alternatively, if the sludge blanket is not allowed to stabilize or form a blanket or is pumped out too frequently the settlement process does not take place at all and solids will remain in suspension. Additionally there is a danger that thin sludge or water will be pumped from the bottom of the tank into the sludge handling system thus reducing the effectiveness of that process.

The SludgeWatch 8200w² Monitor is suitable for mounting outdoors on the bridge of settlement tanks, as the enclosure is IP65 rated and no outer enclosure is required. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available, allowing transmission directly to the control system without the need for installation of cables.

Fixed Sludge Blanket Level Detection Specifications

DIMENSIONS 185 mm (7.2”) x 213 mm (8.3”) x 95 mm (3.7”) (H x W x D) POWER RATING 0.8A
WEIGHT 1.4 kg (3.08 lbs) TERMINAL CORE SIZE Max Conductor Cross Section 2.5mm²
ENCLOSURE MATERIAL Polycarbonate RELAYS 3 x SPCO
ENCLOSURE RATING IP65 RATING 5A at 250VAC and 5A at 30VDC
CABLE ENTRIES 1 x M20, 4 x M16, 1 x USB Type A KEYPAD 6 Key
TEMPERATURE RATING -20 to +70°C, 0 to 95% Humidity (non-condensing) DISPLAY Sunlight Readable Black on White Graphic LCD
POWER SUPPLY 100 to 240 VAC 9 to 36 VDC BACKLIGHT On/Off/On after keypress wtih user adjustable contrast
STANDARD SENSORS DIMENSIONS WEIGHT OPTICAL PATH RANGE CABLE LENGTH SERVICE REQUIREMENT
IR8 Sensor 95 (3.7”) x 8 (0.3”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 8mm 0 – 30,000 10 metres (32.8 ft)
standard
No routine servicing
IR15 Sensor 95 (3.7”) x 15 (0.6”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 15mm 0 – 10,000 10 metres (32.8 ft)
standard
No routine servicing
IR40 Sensor 95 (3.7”) x 40 (1.6”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 40mm 0 – 1,500 10 metres (32.8 ft)
standard
No routine servicing
IR100 Sensor 95 (3.7”) x 100 (3.9”) x 25
(0.9”) mm
0.7 kg (1.54 lbs) inc 10m of cable 100mm 0 – 200 10 metres (32.8 ft)
standard
No routine servicing
SENSOR SETPOINT
TYPICAL APPLICATIONS
IR100 – Range 0 to 200mg/l
The sensor should only be used if the sludge is very ‘light’ with very clear supernatant.
5 to 95% of range Water Treatment
IR40 – Range 0 to 1,500mg/l
This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage
treatment applications and clarifiers in water treatment works.
5 to 95% of range Water Treatment Clarifiers
Sewage Treatment Final Settlement
Humus Tanks
IR15 – Range 0 to10,000mg/l
This sensor is also regularly used for sludge blanket detection and is normally used for primary
settlement in sewage treatment and sludge thickeners in water treatment.
5 to 95% of range Water Treatment Sludge Thickeners
Sewage Treatment Primary Tanks
IR8 – Range 0 to 30,000mg/l
This sensor should be applied on sludge thickeners in sewage treatment plants.
5 to 95% of range Sewage Treatment Thickeners
Note: Sensor ranges and detection points are appoximate and depend on the site-specific nature of the treatment process.

Sludge Detection Sensor TypesSludge Blanket Level Infrared Sensor Options

  • IR100: 0-200mg/l – This sensor is used when sludge is very “light” with very clear supernatant.
  • IR40: 0-1,500mg/l – This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage treatment applications and clarifiers in water treatment works.
  • IR15: 0-10,000 mg/l – This sensor is also regularly used for sludge blanket detection and typically used for primary settlement in sewage treatment and sludge thickeners in water treatment.
  • IR8: 0-30,000 mg/l – This sensor should be applied on sludge thickeners in sewage treatment plants.

Applications:

  • Final Settlement Tanks
  • Primary Settlement Tanks
  • Water Treatment – Clarifiers
  • Thickeners
  • Lamella Separators